$387.
You need a new 'thermocouple' . -In older heaters, cheap and easy for a 'handyman' to fix. In new heaters, very difficult to fix. - Google instructions .
The thermocouple is the small tube that runs between the pilot light and the control valve. The valve end unscrews and the pilot light end in held in place with a spring clip that the tip pushes through. Unscrew the valve end and work the pilot end out by twisting it and pulling it out of the clip. Install a new one making sure the end is in the pilot flame and light the heater. No gas will come out when you take it loose from the control valve.
Condensation, when you heat water the water boils and lets of steam, steam collects around the water heater as condensation.
Yes, some water heaters have magnets in them. Not every water heater does, but the ones that do have magnets are great to use for water treatment reasons.
In a heart beat
There are many pictures of this on Google.
$6 to $10 depending on where you are and where you get it from.
Right below the thermocouple if applicable
Most pilot lights are not adjustable. If it's not working properly the usual solution is to change the thermocouple.
THERMOCOUPLE or defective gas valve
Sounds like you need a thermocouple.
low back, spillage, or a bad thermocouple.
Spillage excessive condensate bad thermocouple draft
Depends on the age of the heater. If you light the pilot with a match, you should be able to remove the thermocouple with the burner in place. The end that is in the flame will pull out of the clip that holds it. The control valve end unscrews. If you have a newer one that lights the pilot with a sparker, you have to remove the burner as a unit. There should be two screws holding the cover plate in place, the gas line to the burner, the thermocouple and the wire for the sparker. Disconnect all of these from the control valve and the unit slides out through the hole. Then change the thermocouple and replace.
It is one or the other. The thermocouple on a gas heater generates a very small current that keeps the gas valve open. A few micro volts. The thermocouple is the small tube that sits in the flame of the pilot light.
It is most likely the thermocouple that is bad. That is what keeps the pilot light on. The thermocouple is the small tube that sits in the flame of the pilot and runs to the control valve.
Thermocouple. Keep pilot knob depressed for 30 seconds after lighting pilot.